First, you won't get it all at once. Instead, Tencent will start you out with a (still hefty) 1TB to start, and then as you fill it up it will apparently pump up your limit until it hits 10TB. No word on whether or not it goes back down if you delete stuff, but there's only one way to find out.

Second, where the hell are these guys getting so much free server space, and why would you ever trust them with that much of your data? Are they using looping hard drives? What is going on?

Tencent's app is also entirely in Chinese, so good luck trying to use it. But maybe this can put some pressure on other cloud players to up the free storage ante? That's sort like asking someone with a water gun to step up its game against a nuclear threat, but it's worth a shot.